Heat sink



FIG. 1 is a perspective view of a heat sink showing my new design;

FIG. 2 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 3 is a front view thereof, the rear view being a mirror image of the front view;

FIG. 4 is a top view thereof; and

FIG. 5 is a bottom view thereof; and

FIG. 6 is a perspective view of a heat sink showing a first alternative embodiment of my new design;

FIG. 7 is a right side view thereof, the left side view being a mirror image of the right side view;

FIG. 8 is a front view thereof, the rear view being a mirror image of the front view;

FIG. 9 is a top view thereof; and,

FIG. 10 is a bottom view thereof.

The heat sink is shown broken away in FIGS. 1-10 of the drawing to indicate indeterminate length, it being understood that it has a uniform shape and appearance through its length.

Portions or features of the heat sink shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for heat sink, as shown and described. 